Festus said with a loud voice. This outcry which Festus doth make doth show how much the truth of God prevaileth with the reprobate; to wit, though it be never so plain and evident, yet is it trodden under foot by their pride. For though those things which Paul had alleged out of the law and prophets had nothing in them which was anything like to madness, but were grounded in good reason, yet he doth attribute the same to madness, not because he seeth any absurdity, but because he refuseth those things which he doth not understand. Nothing was more foolish or more unsavory than the superstitions of the Gentiles, so that their high priests were for good causes ashamed to utter their mysteries, whose folly was more than ridiculous. Festus doth grant that there was learning packed [1] in Paul's speech; nevertheless, because the gospel is hidden from the unbelievers, whose minds Satan hath blinded, (2-Corinthians 4:3) he thinketh that he is a brain-sick fellow which handleth matters intricately. So that though he cannot mock and openly contemn him, yet he is so far from being moved or inwardly touched, that he counteth him a man which is frenzy [frenzied] and of mad curiosity. And this is the cause that he cannot away to mark what he saith, lest he make him mad also; as many at this day fly from the word of God, lest they drown themselves in a labyrinth. And they think that we be mad because we move questions concerning hidden matters, and so become troublesome both to ourselves and also to others. Wherefore, being admonished by this example, let us beg of God that he will show us the light of his doctrine, and that he will therewithal give us a taste thereof, lest through obscurity and hardness it become unsavory, and at length proud loathsomeness break out into blasphemy.

Footnotes

1 - "Reconditam eruditionem," recondite erudition.

Festus said with a loud voice - Amazed at the zeal of Paul. Paul doubtless evinced deep interest in the subject, and great earnestness in the delivery of his defense.
Thou art beside thyself - Thou art deranged; thou art insane. The reasons why Festus thought Paul mad were, probably:
(1) His great earnestness and excitement on the subject.
(2) his laying such stress on the gospel of the despised Jesus of Nazareth, as if it were a matter of infinite moment. Festus despised it; and he regarded it as proof of derangement that so much importance was attached to it.
(3) Festus regarded, probably, the whole story of the vision that Paul said had appeared to him as the effect of an inflamed and excited imagination, and as a proof of delirium. This is not an uncommon charge against those who are Christians, and especially when they evince unusual zeal. Sinners regard them as under the influence of delirium and fanaticism; as terrified by imaginary and superstitious fears; or as misguided by fanatical leaders. Husbands often thus think their wives to be deranged, and parents perceive their children that, and wicked people assume the ministers of the gospel to be crazy. The frivolous think it proof of derangement that others are serious, anxious, and prayerful; the rich, that others are willing to part with their property to do good; the ambitious and worldly, that others are willing to leave their country and home to go among the Gentiles to spend their lives in making known the unsearchable riches of Christ. The really sober and rational part of the world they who fear God and keep his commandments; they who believe that eternity is before them, and who strive to live for it - are thus charged with insanity by those who are really deluded, and who are thus living lives of madness and folly. The tenants of a madhouse often think all others deranged but themselves; but there is no madness so great, no delirium so awful, as to neglect the eternal interest of the soul for the sake of the pleasures and honors which this life can give.
Much learning - It is probable that Festus was acquainted with the fact that Paul was a learned man. Paul had not, while before him, manifested particularly his learning. But Festus, acquainted in some way with the fact that he was well-educated, supposed that his brain had been turned, and that the effect of it was seen by devotion to a fanatical form of religion. The tendency of long-continued and intense application to produce mental derangement is everywhere known.
Doth make thee mad - Impels, drives, or excites thee περιτρέπει peritrepei to madness.

Paul, thou art beside thyself - "Thou art mad, Paul!" "Thy great learning hath turned thee into a madman." As we sometimes say, thou art cracked, and thy brain is turned. By the τα πολλα γραμματα it is likely that Festus meant no more than this, that Paul had got such a vast variety of knowledge, that his brain was overcharged with it: for, in this speech, Paul makes no particular show of what we call learning; for he quotes none of their celebrated authors, as he did on other occasions; see Acts 17:28. But he here spoke of spiritual things, of which Festus, as a Roman heathen, could have no conception; and this would lead him to conclude that Paul was actually deranged. This is not an uncommon case with many professing Christianity; who, when a man speaks on experimental religion, on the life of God in the soul of man - of the knowledge of salvation, by the remission of sins - of the witness of the Spirit, etc., etc., things essential to that Christianity by which the soul is saved, are ready to cry out, Thou art mad: he is an enthusiast: that is, a religious madman; one who is not worthy to be regarded; and yet, strange to tell, these very persons who thus cry out are surprised that Festus should have supposed that Paul was beside himself!

(8) And as he thus spake for himself, Festus said with a loud voice, Paul, thou art beside thyself; much learning doth make thee mad.
(8) The wisdom of God is madness to fools, yet nonetheless we must boldly confirm the truth.

And as he thus spake for himself,.... Asserting the integrity and innocence of his past life and conversation, in proof of which he appealed to the Jews themselves; setting forth the prejudices to the Christian religion he had been under; declaring the heavenly vision that had appeared to him, and the divine orders he had received; alleging, that in his ministry there was an entire harmony between him, and the writings of Moses, and the prophets, for which the Jews professed a veneration; as he was thus vindicating himself, ere he had well finished his apology,
Festus said with a loud voice; that all might hear, and being moved with resentment at what he had heard; and it may be, he was displeased with Paul that he took so much notice of Agrippa, and so often addressed him, and appealed to him, when he scarce ever turned to, or looked at him:
Paul, thou art beside thyself; not in thy senses, or right mind, to talk of such an appearance and vision, and especially of the resurrection of a person from the dead. This is no unusual thing for the ministers of the Gospel to be reckoned madmen, and the doctrines they preach madness and folly: our Lord himself was said to be beside himself, and to have a devil, and be mad; and so were his apostles, Mark 3:21 and it is not to be wondered at that natural men should entertain such an opinion of them, since what they deliver is quite out of their sphere and reach: Festus added,
much learning doth make thee mad; the apostle was a man of much learning, both Jewish, Greek, and Roman; and Festus perceived him to be of great reading by his making mention of Moses, and the prophets, writings which he knew nothing at all of. And as this sometimes is the case, that much reading, and hard study, do cause men to be beside themselves, he thought it was Paul's case: so the philosopher (f) suggests, that men of great wit and learning, and who are closely engaged in study, whether in philosophy, or politics, or poetry, or in technical affairs, are inclined to be melancholy, and phrenetic.
(f) Aristotel. Problem. sect. 30.

It becomes us, on all occasions, to speak the words of truth and soberness, and then we need not be troubled at the unjust censures of men. Active and laborious followers of the gospel often have been despised as dreamers or madmen, for believing such doctrines and such wonderful facts; and for attesting that the same faith and diligence, and an experience like their own, are necessary to all men, whatever their rank, in order to their salvation. But apostles and prophets, and the Son of God himself, were exposed to this charge; and none need be moved thereby, when Divine grace has made them wise unto salvation. Agrippa saw a great deal of reason for Christianity. His understanding and judgment were for the time convinced, but his heart was not changed. And his conduct and temper were widely different from the humility and spirituality of the gospel. Many are almost persuaded to be religious, who are not quite persuaded; they are under strong convictions of their duty, and of the excellence of the ways of God, yet do not pursue their convictions. Paul urged that it was the concern of every one to become a true Christian; that there is grace enough in Christ for all. He expressed his full conviction of the truth of the gospel, the absolute necessity of faith in Christ in order to salvation. Such salvation from such bondage, the gospel of Christ offers to the Gentiles; to a lost world. Yet it is with much difficulty that any person can be persuaded he needs a work of grace on his heart, like that which was needful for the conversion of the Gentiles. Let us beware of fatal hesitation in our own conduct; and recollect how far the being almost persuaded to be a Christian, is from being altogether such a one as every true believer is.

Festus said with a loud voice--surprised and bewildered.
Paul, thou art beside thyself, much learning doth make thee mad--"is turning thy head." The union of flowing Greek, deep acquaintance with the sacred writings of his nation, reference to a resurrection and other doctrines to a Roman utterly unintelligible, and, above all, lofty religious earnestness, so strange to the cultivated, cold-hearted skeptics of that day--may account for this sudden exclamation.

Paul, thou art beside thyself. The earnestness and fervor of Paul were so strange to Festus, his doctrine of the resurrection so novel, his manner so sincere, and his testimony so startling, that the Roman could only explain it by a mental delusion. The display of such vast knowledge of the Hebrew Scriptures to Agrippa convinced him that intense study resulted in derangement. It must not be forgotten that Festus had just come into his position, and knew little of Paul.
I am not mad, most noble Festus. The courteous answer shows the mistake of Festus, a mistake due to his ignorance of the subject.
The king knoweth. The facts that he had cited in his discourse were well known to the king, viz., the predictions of the prophets, the hope of a Messiah, the death of Jesus, and the spread of the congregations of those who believed that he was a risen Lord.

Festus said, Paul, thou art beside thyself - To talk of men's rising from the dead! And of a Jew's enlightening not only his own nation, but tho polite and learned Greeks and Romans! Nay, Festus, it is thou that art beside thyself. That strikest quite wide of the mark. And no wonder: he saw that nature did not act in Paul; but the grace that acted in him he did not see. And therefore he took all this ardour which animated the apostle for a mere start of learned phrensy.